Configure Path MTU Discovery

For supported software information, click here.

You can configure path MTU discovery (PMTUD) on Versa Operating System^TM (VOS^TM) devices so that they can determine the maximum transmission unit (MTU) size on the network path between two IP hosts.

To configure PMTUD:

1. In Director view:
   1. Select the Configuration tab in the top menu bar.
   2. Select Devices > Devices in the horizontal menu bar.
   3. Select a Controller or VOS device in the main pane. The view changes to Appliance view.
2. Select the Configuration tab in the top menu bar.
3. Select Others > System > Configuration > Configuration in the left menu bar.
4. In the main pane, locate the Service Options panel:
   
   
5. Click the Edit icon. In the Edit Service Options popup window, select the Path MTU Discover tab, and enter information for the following fields.
   
   
    

   Field	Description
   Path MTU Discovery	Click to enable PMTUD. If you change this setting, you must perform a service restart.
   Maximum Converged Range	Enter the maximum converged probe range. A probe starts with the PMTU search range and then moves the lower limit (minimum probe packet size) upward and upper limit (EMTU) downward until the range is equal to or smaller than the maximum converged range. Then the probe is considered to be converged. Default: 10 bytes
   Maximum Path RTT Time	Enter the maximum path round-trip time, in milliseconds. Default: 2000 milliseconds
   Minimum Probe Packet Size	Enter the smallest probe packet size, in bytes. Default: 1024 bytes
   Path MTU Aging Time	Enter the PMTU aging time, in seconds, after which the process expires. A new probe is initiated within this interval to keep the record fresh. For a management path that connects to a Controller node, at least one probe is initiated in in each 24-hour period. Default: 600 seconds.

6. Click OK.